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November 4th, 2015, 01:57 PM   #1
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Quick Percentages and Divisions

Hi All
I am new here, but I am pretty rusty with my math and need some help. I am trying to calculate quick % and also divisions. Here's a typical problem:

I'd like to know how to quick get the % of 3.25/85?

I've tried the long division route that's shown on maths tutorials, but I struggle when I have to deal with the 0.25.

Also, once I have that answer (3.82%), what's the easiest way to do 1/3.82% (to get 26.2)?

Thanks for your help; really appreciated!

Last edited by skipjack; November 4th, 2015 at 06:24 PM.
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November 4th, 2015, 05:21 PM   #2
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Why long division?
Do you not have a calculator?

3.25/85 = .0382352....
That's a simple division.
Where does the "percentage" come in?

Percentages work along the lines of:
6% tax on purchase of 2000 ?
2000 * .06 = 120
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November 4th, 2015, 06:31 PM   #3
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3.25/85 = 0.65/17, which would make long division a bit easer, but it's still quicker to use a calculator (such as Google).

Similarly, 17/0.65 = 340/13 = 26.15..., but why you would need to calculate this is unclear.
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November 5th, 2015, 12:15 AM   #4
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Quote:
Originally Posted by Ps65 View Post
I'd like to know how to quick get the % of 3.25/85?

I've tried the long division route that's shown on maths tutorials, but I struggle when I have to deal with the 0.25.
If you're having a hard time dealing with 0.25, you can multiply both numerator and denominator by 100 so that the fraction becomes 325/8500, which still has the same value with the original fraction.
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